Hello I'm still on 003FW (Minix x8h) but maybe this problem it'also in 004FW. I've watched a movie on xbmc with wireless headphones connected to Minix. I shutdown Minix without disconnect headphones. Then I disconnect headphones and power on Minix. Watching a movie with Minix I've no audio (PCM setting). I've solved the problem connecting and then disconnecting headphones during the movie playing. Hope this help!